Effect of One Dimensional Ceria Morphology on Cuo/Ceo2 Catalysts for Co Preferential Oxidation

The one-dimensional CeO2 nanocrystals (nanorods, nanowires and nanotubes) were synthesized by hydrothermal methods and supported CuO for CO preferential oxidation (CO-PROX). The supports and catalysts were characterized by various techniques. The results show that the morphologies of support and the interaction between copper species and ceria greatly affect the activity of catalysts. Compared with CeO2-W and CeO2-R, CeO2-T presents higher activity at low-temperature. After loading CuO, the strong interaction between CuO and CeO2 nanocrystals makes the activity of CuCeO catalysts much higher than that of CeO2. Among the CuCeO catalysts, CuCeO-T displays the best catalytic activity for CO oxidation. The CO conversion over CuCeO-T can reach to 100% at 100 ​°C with O2 selectivity of 89%. The addition of copper species further enriches the surface defects, Ce3+ concentration and oxygen vacancies, which should be the main reason for the high activity of CuCeO-T catalyst.